I am currently on the fence on wether to send my motor out to Jim from Passion for one of his OEM 4mil builds. I am between that or a 421 serval 4mil build. Just wanted to know what you guys think? My current mods are a drag port, bored .020 over, 34mikuni flatsides, VF3 reeds, 16/38 gearing, 20cc domes Modquad cool head, T5's, Billet water impeller, K&N pod filters, and a HD clutch. My bike absolutely rips already with this setup, just basically wondering if I will notice a big difference with the work I am thinking about doing with Jim. Any replies would be much appreciated. My bike is used for trails, as in dirt and gravel trails, not much woods riding in miami, Florida. I do drag race here and there, but mostly just do top speed runs on asphalt.